In cloud formation, water vapor turns into water droplets which get bigger and bigger until it rains. This will cause the temperature of the air in the clouds to
a. get warmer.
b. get cooler.
c. will not affect the temperature of the air in the clouds.
d. There is no air in clouds.
a
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A horizontal wire of length 3.6 m carries a current of 6.0 A and is oriented so that the current direction is 50° S of W. The Earth's magnetic field is due north at this point and has a strength of 0.14 × 10^-4 T. What is the size of the force on the wire?
a. 1.6 × 10^-4 N c. 1.9 × 10^-4 N b. 0.28 × 10^-4 N d. 2.5 × 10^-4 N
A group of one hundred to a few thousand stars in a region of 25 pc in diameter that were created at the same time and our bound together by gravity is called a(n) ____
a. associated cluster b. open cluster c. closed cluster d. globular cluster e. nebular cluster
The focal lengths of the objective and eyepiece in a compound microscope are 0.50 cm and 2.00 cm, respectively. An object is placed at a distance of 0.52 cm from the objective
If the final image seen by the eye is at a distance of 25 cm from it, what is the magnification? A) -125 B) -100 C) -225 D) -325 E) -425
Copernicus proposed his theory because
A) he thought that Ptolemy's theory was too messy and that his was more "fitting." B) it was obvious to most educated people by that time that Earth orbits the sun. C) Ptolemy's theory was known to be wrong. D) it was more in line with Church thinking than was the pre-Christian Greek theory. E) it fit the data taken by Tycho Brahe.